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3 percent is great. You should do a couple of other cylinders for comparison. Hiss in oil fill is normal air past rings on leak down test. Hiss in exhaust is not normal and could mean a leaking exhuast valve. If that is the case it will slowly get worse and eventually burn the valve. No hurry to fix it though unless you don't want to buy a new valve. The fouled plug is probably from that cylinder misfiring and running rich as a result. Could you have hit the valve on a piston when you were doing the cam timing?
-Andy
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72 Carrera RS replica, Spec 911 racer
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